History (Sanskrit: Jval; Anglo-Saxon gold; Latin: aurum). Gold has been known and highly valued since primeval times. This element is found in nature as a separate metal and in tellurides. Gold is very widely spread and is always associated with quartz or pyrite.
Sources Gold deposits are found in veins and alluvial and often separated from rocks and other minerals by mining and panning process. About two-thirds of the world's gold production comes from South Africa and about two-thirds of total U.S. production comes from the state of South Dakota and Nevada. The metal was taken from the ore-ore in various ways: cynaniding, amalgamating, and smelting. Purification process is also frequently done by electrolysis. Gold is also contained in sea water about 0.1 to 2 mg / ton, depending on where the seawater samples taken. Until now, not yet discovered how to mine gold from sea water which can provide a profit.
Usefulness Gold is widely used to make coins and used as a monetary standard in many countries. This element is also widely used for jewelry, artificial teeth, and as a layer. For applications in science, gold is used as a layer several space satellites and is a good reflector of infrared light. Gold is not easy to react (inert).
Isotope Gold compounds are most widely chlorauric auric chloride and acid, the latter widely used in the field of photography to make ink and silver shadow. Gold has 18 isotopes; 198Au with part-time during the 2.7 days and used for the treatment of cancer and other diseases. Disodium aurothiomalate provided through through the muscle (intramuscularly) as an arthritis therapy. Mixture of nitric acid with three of hydrochloric acid is called aqua regia (because it dissolves gold, the king of metals). Gold is also available commercially with a purity of 99.9999 +%. Gold freezing point at 1063.0 degrees Celsius over the years been used as a calibration point by the International Temperature Scales (ITS-27 and ITS-48) and by the International Practical Temperature Scale (IPTS-48). In 1968, a new IPTS standards (IPTS-68) was adopted, which alter the freezing point of gold to 1064.43 degrees Celsius. The density of gold change according to temperature and how the metal is precipitated, and cold-worked.
Gold is a metal
Gold is a metal that is soft and malleable, hardness ranged between 2.5 - 3 (Mohs scale), and its density depends on the type and content of other metals combined with it. Mineral gold carrier usually associated with minerals (gangue minerals). Associated minerals are generally quartz, carbonate, tourmaline, flourpar, and a small number of non-metallic minerals. Mineral gold carrier was also associated with sulphide deposits that have been oxidized. Carrier mineral of gold consists of gold nativ, elektrum, telurida gold, some gold alloys and compounds with the elements sulfur, antimony, and selenium. Elektrum actually another type of gold nativ, only the silver content in it> 20%.
Gold formed from the process or pengkonsentrasian magmatisme on the surface. Some of the sediment formed by the process metasomatisme contacts and hydrothermal solutions, while the mechanically produced precipitate pengkonsentrasian put (placer). Genesis of gold that is categorized into two primary sediment and sediment plaser
Gold is widely used as an item of jewelry, foreign exchange reserves, etc..
The potential of gold deposits found in almost every region in Indonesia, such as in Sumatra, Riau Islands, Kalimantan, Java, Sulawesi, Nusa Tenggara, Maluku and Papua.
Gold formed from the process or pengkonsentrasian magmatisme on the surface. Some of the sediment formed by the process metasomatisme contacts and hydrothermal solutions, while the mechanically produced precipitate pengkonsentrasian put (placer). Genesis of gold that is categorized into two primary sediment and sediment plaser
Gold is widely used as an item of jewelry, foreign exchange reserves, etc..
The potential of gold deposits found in almost every region in Indonesia, such as in Sumatra, Riau Islands, Kalimantan, Java, Sulawesi, Nusa Tenggara, Maluku and Papua.
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